Table 6 Identified causal combinations of the target project.
No | Symbol | Causal combination | |
|---|---|---|---|
Source | Accident | ||
1 | S1-A1 | Faults | Collapse |
2 | S2-A1 | Shallow cover depth | |
3 | S3-A1 | Mixed ground | |
4 | S4-A1 | Cross-passage | |
5 | S5-A1 | High water pressure | |
6 | S1-A2 | Faults | Surface settlement |
7 | S2-A2 | Shallow cover depth | |
8 | S3-A2 | Mixed ground | |
9 | S4-A2 | Cross-passage | |
10 | S5-A2 | High water pressure | |
11 | S6-A2 | Weathered ground | |
12 | S1-A3 | Faults | Heaving/blow-out |
13 | S2-A3 | Shallow cover depth | |
14 | S1-A4 | Faults | Mud/water inflow |
15 | S4-A4 | Cross-passage | |
16 | S5-A4 | High water pressure | |
17 | S6-A4 | Weathered ground | |
18 | S1-A5 | Faults | Cutter head blockage |
19 | S3-A5 | Mixed ground | |
